A contract does not exist until both sides agree. Acceptance is the clear agreement to the exact terms of an offer, forming a binding contract once communicated to the offeror.

Acceptance must mirror the offer under the traditional mirror-image rule; any change creates a counteroffer instead. It can occur through words, conduct, or performance, depending on what the offer invites. Silence rarely counts unless prior dealings make it reasonable.

Timing matters. Acceptance is effective when sent under the mailbox rule in many jurisdictions, provided the method is reasonable. Once accepted, the parties are locked into the bargain and later regrets do not undo the agreement. Clear communication prevents disputes about whether a deal was ever struck.

• Agreement to the terms of an offer
• Creates a binding contract when properly communicated
• Must generally match the offer without material changes
• May occur by words, conduct, or performance